ISPSoft User Manual 15.1 Continuous Function Charts (CFC) 15.1.1 About Continuous Function Charts Continuous Function Chart (CFC) is a PLC programming language in extension to the IEC 61131-3 standard. CFC is often used in the area of motion control. The most significant feature is its graphical programming language basing on the function block diagram language. Comparing to other PLC programming languages, CFC can provide a more logical relation between input and output and a more clear execution order of the program. The operation principle of CFC will not be covered in this chapter; this chapter will only focus on the creation and operation of CFC in ISPSoft.
15.1.2 Things to Note When Using CFC It supports keyboards but does not support the instructions of LD, LDI, LDP, and LDF. Users can type the register or the name of the variable, and the system will add input node in the back. Inputted data is not case-sensitive, any uppercase or lowercase character can be entered. For example, OUT, Out and out are all correct. Common positional numeral systems: Decimal range: 2345 Hexadecimal range: 16#5BA0 Floating point number: 4.123 *. The K and H notations are supported. There is no limit on the number of the loops for CFC to edit. But the size of a edited programs should not be larger than the memory size.
The input pin of nodes, logic gates, instructions, and function blocks can only be from one origin. But the targets of the output pin can be multiple. 15-2